Back To Top
Rosemount™ 628 Universal Gas Sensor
The Rosemount 628 Series of electrochemical toxic gas sensors provides high specificity, fast response and long life.
All Rosemount 628 Sensors are compatible with the Rosemount 928 Wireless Gas Monitor. The electrochemical sensor cell incorporates industry-standard technology that is used in conventional wired gas detectors to bring consistent toxic gas sensing to challenging and remote locations. Gas sensor types include hydrogen sulfide (H2S), carbon monoxide (CO), and oxygen depletion (O2).
Rosemount™ 628 Universal Gas Sensor


Operating Temperature
H2S: -40 °F to +122 °F (-40 °C to +50 °C )
O2 Depletion: -22 °F to +122 °F (-30 °C to +50 °C)
CO: -22 °F to +122 °F (-30 °C to +50 °C)
H2S: ±3 ppm or 10% of reading, whichever is greater
O2 Depletion: Within ±0.5% of oxygen content of supply gas
CO: ±6 ppm or 10% of reading, whichever is greater
Time Constant / Response
H2S: T90 < 45 seconds
O2 Depletion: T90 < 15 seconds
CO: T90 < 29 seconds
Detection Range
H2S: Gas Concentration Level 0-100 ppm range
O2 Depletion: Gas Concentration Level 0-25% by volume
CO: Gas Concentration Level 0-1,000 ppm range
Intrinsically Safe, CSA Div 1 ANSI/ISA 92.00-2010 (R2015), ATEX/IECEx Zone 0


  • Hot-swappable electrochemical sensor module with end-of-life diagnostics that can be installed in the field without tools.
  • Intrinsically safe sensor assembly that consists of an electrochemical sensor element mounted in a rugged polymer sensor module
  • WirelessHART® technology is secure, cost-effective and delivers >99% data reliability


Interested in attending a training class?

Visit Course Listing